====== Decagon MPS-6 Water Potential Sensor ======

I have a couple of these.

It seems Decagon was bought and the product renamed to TEROS 21.

{{ :mps-6_manual.pdf |}}

[[https://edaphic.com.au/wp-content/uploads/2020/03/TEROS21_Manual_January-2019.pdf]]

===== Wire =====

  * Shield / Bare: Ground
  * White: Power, 3.6V to 15V
  * Red: Signal

===== Serial Protocol =====

  * Serial (UART) or SDI-12.
  * 1200 baud, 8N1.
  * 0 - 3.6V levels, active low
  * Sends a reading automatically ~40mS after power applied.

Data format:
''<water potential in kilopascals> <temperature in C>\r''